Question 1

Which of the following binary hydrides has the highest melting point?

Accepted Answer

A) AlH3 
B) CaH2 
C) NH3 
D) SnH4 
A) AlH3 
B) CaH2 
C) NH3 
D) SnH4

Question 2

If niobium loses all of its valence electrons when it reacts with fluorine,what is the formula of the neutral binary compound that results?

Accepted Answer

The answer of If niobium loses all of its valence...

Question 3

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (4)shown above?

Accepted Answer

A) element A 
B) element B 
C) element C 
D) element D 
A) element A 
B) element B 
C) element C 
D) element D

Question 4

The elements indicated by the shaded area in the following periodic table are all

Accepted Answer

A) gases. 
B) metals. 
C) nonmetals. 
D) semimetals. 
A) gases. 
B) metals. 
C) nonmetals. 
D) semimetals.

Question 5

The charge,n,on the cyclic anion Si6O18n that is found in the mineral beryl is ________.

Accepted Answer

Question 6

In the following pictures representing binary hydrides AHS1U1B1xS1U1B0,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A.  
-The binary hydride shown in picture (4)is classified as

Accepted Answer

A) covalent. 
B) interstitial (metallic). 
C) ionic. 
D) None of these 
A) covalent. 
B) interstitial (metallic). 
C) ionic. 
D) None of these

Question 7

-Using the above models of hydrides,indicate the one most representative of an ionic hydride.

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
A) I 
B) II 
C) III 
D) IV

Question 8

-Which element indicated on the above periodic table forms a binary oxide with molecular structure (1)shown above?

Accepted Answer

A) element A 
B) element B 
C) element C 
D) element D 
A) element A 
B) element B 
C) element C 
D) element D

Question 9

Which statement is most inconsistent with the chemistry of silicon?

Accepted Answer

A) In nature,it is generally found combined with oxygen in SiO2 and in various silicate minerals. 
B) It crystallizes in a diamond-like structure and does not form the graphite-like allotrope. 
C) It is a hard,gray,semiconducting solid that melts at 1410°C. 
D) It is obtained by oxidation of silica sand with coke. 
A) In nature,it is generally found combined with oxygen in SiO2 and in various silicate minerals. 
B) It crystallizes in a diamond-like structure and does not form the graphite-like allotrope. 
C) It is a hard,gray,semiconducting solid that melts at 1410°C. 
D) It is obtained by oxidation of silica sand with coke.

Question 10

What is the structure of white phosphorus?

Accepted Answer

A) cage system of Px molecules 
B) discrete P atoms 
C) discrete P4 molecules 
D) polymeric chain-like structure 
A) cage system of Px molecules 
B) discrete P atoms 
C) discrete P4 molecules 
D) polymeric chain-like structure

Question 11

Group 2A metals tend to be somewhat less reactive than alkali metals,and the order of their reactivity is

Accepted Answer

A) Ba > Sr > Ca > Mg > Be. 
B) Be > Mg > Ca > Sr > Ba. 
C) Ca > Mg > Be > Ba > Sr. 
D) Sr > Ca > Mg > Be > Ba. 
A) Ba > Sr > Ca > Mg > Be. 
B) Be > Mg > Ca > Sr > Ba. 
C) Ca > Mg > Be > Ba > Sr. 
D) Sr > Ca > Mg > Be > Ba.

Question 12

What is not an appropriate method for the isolation of elemental boron?

Accepted Answer

A) refluxing borax with sodium peroxide 
B) high temperature reduction of B2O3 with magnesium 
C) high temperature reduction of BBr3 with hydrogen over a Ta wire 
D) electrolytic reduction of aqueous B(OH)3 
A) refluxing borax with sodium peroxide 
B) high temperature reduction of B2O3 with magnesium 
C) high temperature reduction of BBr3 with hydrogen over a Ta wire 
D) electrolytic reduction of aqueous B(OH)3

Question 13

When the equation for the reaction of KBr(aq)with MnO2(s)to produce Br2 and Mn2+(aq)in acidic solution is balanced,the coefficient in front of the Br2 is ________.

Accepted Answer

Question 14

At 25°C the elements indicated by the shaded area in the following periodic table are all

Accepted Answer

A) diatomic molecules. 
B) gases. 
C) liquids. 
D) nonmetals that are solids. 
A) diatomic molecules. 
B) gases. 
C) liquids. 
D) nonmetals that are solids.

Question 15

How would one synthesize a perchlorate salt?

Accepted Answer

A) Electrolytic oxidation of a solution of chorate salt. 
B) Electrolytic oxidation of a solution of chorite salt. 
C) Electrolytic oxidation of a solution of hypochlorite salt. 
D) Oxidation of a solution of chlorate salt by a perbromate salt. 
A) Electrolytic oxidation of a solution of chorate salt. 
B) Electrolytic oxidation of a solution of chorite salt. 
C) Electrolytic oxidation of a solution of hypochlorite salt. 
D) Oxidation of a solution of chlorate salt by a perbromate salt.

Question 16

What is the structure of sulfuric acid?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 17

Using principles discussed in chapters 15 and 19,determine which of the following is the strongest acid.

Accepted Answer

A) HClO2 
B) HClO3 
C) HBrO3 
D) HIO3 
A) HClO2 
B) HClO3 
C) HBrO3 
D) HIO3

Question 18

What is not a true statement?

Accepted Answer

A) BeO is amphoteric but the oxides of the other group 2A elements are basic. 
B) B differs from other elements of group 3A by forming mainly covalent molecular compounds. 
C) BF3 is a gaseous molecular halide but AlF3 is a high melting ionic solid. 
D) Compounds with C=C double bonds and Si=Si double bonds are quite common. 
A) BeO is amphoteric but the oxides of the other group 2A elements are basic. 
B) B differs from other elements of group 3A by forming mainly covalent molecular compounds. 
C) BF3 is a gaseous molecular halide but AlF3 is a high melting ionic solid. 
D) Compounds with C=C double bonds and Si=Si double bonds are quite common.

Question 19

The oxidation number of the oxygen atoms in CaO2 is ________.

Accepted Answer

Question 20

Shown below are four oxoanions of sulfur.Small gray spheres represent hydrogen,unshaded spheres represent oxygen,and dotted spheres represent sulfur.  
-Which oxoanion is the strongest base?

Accepted Answer

A) oxoanion (1) 
B) oxoanion (2) 
C) oxoanion (3) 
D) oxoanion (4) 
A) oxoanion (1) 
B) oxoanion (2) 
C) oxoanion (3) 
D) oxoanion (4)

Exam 22: The Main-Group Elements

Which of the following binary hydrides has the highest melting point?

If niobium loses all of its valence electrons when it reacts with fluorine,what is the formula of the neutral binary compound that results?

-Which element indicated on the above periodic table forms a binary hydride with molecular structure (4)shown above?

The elements indicated by the shaded area in the following periodic table are all

The charge,n,on the cyclic anion Si6O18n that is found in the mineral beryl is ________.

In the following pictures representing binary hydrides AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (4)is classified as

-Using the above models of hydrides,indicate the one most representative of an ionic hydride.

-Which element indicated on the above periodic table forms a binary oxide with molecular structure (1)shown above?

Which statement is most inconsistent with the chemistry of silicon?

What is the structure of white phosphorus?

Group 2A metals tend to be somewhat less reactive than alkali metals,and the order of their reactivity is

What is not an appropriate method for the isolation of elemental boron?

When the equation for the reaction of KBr(aq)with MnO2(s)to produce Br2 and Mn2+(aq)in acidic solution is balanced,the coefficient in front of the Br2 is ________.

At 25°C the elements indicated by the shaded area in the following periodic table are all

How would one synthesize a perchlorate salt?

What is the structure of sulfuric acid?

Using principles discussed in chapters 15 and 19,determine which of the following is the strongest acid.

What is not a true statement?

The oxidation number of the oxygen atoms in CaO2 is ________.

Shown below are four oxoanions of sulfur.Small gray spheres represent hydrogen,unshaded spheres represent oxygen,and dotted spheres represent sulfur. -Which oxoanion is the strongest base?

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Aqueous Equilibria: Acids and Bases

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Filters

The charge,n,on the cyclic anion Si₆O₁₈ⁿ that is found in the mineral beryl is ________.

In the following pictures representing binary hydrides AH_x,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. -The binary hydride shown in picture (4)is classified as

When the equation for the reaction of KBr(aq)with MnO₂(s)to produce Br₂ and Mn²⁺(aq)in acidic solution is balanced,the coefficient in front of the Br₂ is ________.

The oxidation number of the oxygen atoms in CaO₂ is ________.